Techniques are described for facilitating use of invocable services by applications in a configurable manner. In at least some situations, the invocable services are Web services or other network-accessible services that are made available by providers of the services for use by others in exchange for fees defined by the service providers. The described techniques facilitate use of such invocable services by applications in a manner configured by the developers of the applications, including to allow the application developers to configure pricing terms that will be used to determine fees that end users of the applications will be charged for use of the invocable services via the applications. In some situations, the configured pricing terms for a service specify fees for end users that differ in one or more ways from the defined fees charged by the provider of that service.